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Dissociative chemisorption of methane on Ni(100) and Ni(111) surfaces with preadsorbed potassium in the coverage range 0–0.12 monolayer (ML) has been measured at 475 and 500 K. The results show that the methane sticking probability is strongly diminished by the presence of potassium. An explanation for this surprising inhibition has been sought by performing large-scale density functional theory calculations...